Pocket electric incandescent lamp.



y P.BLAU. POCKET ELEOTBIOINOANDESGENT LAMP.

APPLICATION FILED APB. 28. 1906.

l /z//z/ www In/ 1 fw; 7%# m- Patented Mar. 30, 1909.

.To all whom 'it may concern: -Be it known that I, FR'rrz f side viewUNITED STATES. PATENT oE-EioE.

'FRITZ BLAU, oE BERLIN, GERMANY, lAssIcrNoR To DEUTSCHE GASGLUHLICHTAKTIEN- r A GESELLSCHAFT,,(AUERGESELLSGHAETQ or BERLIN. GERMANY.

rocxE'rjELEcrmc INcANDEscEN'r LAMP.

No. aldeas.

'I kSpeeiic'ation o! Letters Patent. Patented March B, 19,09.4

fhpplcation filed. April 28, 1906. Serial No. 314,116.

BLAU, chemist, a subject of the Emperor of Austria-Hungary, and aresident of Alte J akobstrasse 139, Berlin, Germany,h ave inventedcertain new and useful Improvements in Pocket Electric IncandescentLamps; and I do hereby declare lthe following to be. a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the vaccompanying drawings', and to letters of referencemarked thereon, which form a part of this specification.

My'invention relates to improvements in pocket electric ,incandescentlamps, and more particularly to' suchlamps in which a dry battery isvrprovided to energize the lamp whenever contact is rade between theproper poles of the lamp an the battery. In lamps of this. classheretofore in use the contact between said poles was made by means ot'an intermediate movable element, thecircuit be'- 'ing closed or opened,by means of a push button oranother appropriate element. u

Now, the object of my improvement is to `provide' a lamp of this class,in which theA electric circuit i'slclosed o: opened by 'y merelydisplacing one of the movable Vparts ot the device, vizi the/lamp or 1tssupport, relatively to the other'one, viz. the battery or its sup- Insaid drawing: Figure l is a vertical cross-section of an example of myimproved lamp,- in which the displacement of the parts is effected byturning the lamp-support on the casing for the dry battery, both partsbeing provided with screw threads. Fig. 2 is a of a structure similar tothat of Fig. l, in which, however, the displacement is veffected by .alug provided on one of the Y arts and sliding in an inclined slit of theother part, and Fig. 3 illustrates an example, in which one partis'longitudinally` slidable within the other, a spring op the like beingprovided normally to hold t e parts in their retracted position.

"Similar letters of reference refer to simi-y closing tie-same isprovided, at its upper i part, vwith screw threads 7L. Adapted to bescrewed on the casing a, a casing or other support b for theincandescent lamp is provided with screw threads b. The lamp c issupported within the casing c by any preferred means. In the presentexample I have shown. ior the 'purpose of illustration, a

layer l ot plaster of paris. In front of the lamp, the casing is closedby means of a lens e.

One pole of the lamp may be connected with the corresponding pole Iofthe battery in any preferred way. In the present instance, the outerpoles4 of the battery and lamp are connected to the metallic casin s aand o, respectively, whereby a reliab e contact 1sI secured. The innerand central pole g of the lamp is designed to close the circuit. Forthis purpose, the corresponding pole f of the battery is so arranged, asto be in the path of the pole g, whenI the parts a and e are' screwedone tothe other, both poles being located centrally within their`respective casing. The pole fis preferably, made of carbon. .Normallythe parts a and c are. screwed one to the other, but to such an extentonly, that the poles f and g` are clit of contact.

4When it is desiredto energize the lamp, it

is but necessary slightly to turn the casing e on the casing a, untilthe poles f and g are brought together, whereby the circuit willbe-closed through theppole f of the battery, the pole g of the lamp, thefilament, the casing b, the casing a and the second pole of the battery.n

The example, shown in Fig. 2, issubstantially the same as that shown inFig. l, the difference being, that the serew-threads b and hare replacedby a lu` provided on the casing a, andan incline slit 7c provided in thewall ofthe casing b. The operation of the device is the same fs that ofFig. 1.

In the example shown in `Fi tery a is longitudinally slidablgil withinthe lower part 6I the casing b. The open'bottom of the latter is rovidedwith a ring Z screwedthereto and aving an inner flange m forming anabutment for the battery a, to prevent the lsame from falling out of thecasmg b. vThe upper part of the latter, the lam andthe contact f areidentical with that of Fig. 1. However, I provide a coiled spring n orthe like, within theupper part of the casing b, to hold the battery anormally downward and away from the lamp.

3, the bat- When it is desired to energize the lamp, it is but necessaryto raise the battery a by pushing the linger through theopening of thering Z, whereby the poles f and g will be made to contact.

I claim:

1. The combination oi the battery and the lampcarrier one movablerelatively to the other in the direction of the batterys axis, saidcarrier remaining in conductive relation to one of the battery polesduring such move- 1nent,'and the other pole of the battery beingarranged centrally, and a lamp secured to said carrier and having one oflts terminals connected with said carrier while theother lamp terminalis arranged centrally and adapted to be moved into and out of conta/ctwith the central pole of the batteryT by the said relative movement ofbattery andcarrier.

2. The combination of the battery and the i lamp carrier one rotatablerelatively to the other and each `formed with coperating elements tocause` the battery and carrier to move lengthwise one relatively to theother upon their relative rotation, said carrier remaining in conductiverelation to one of the battery poles during such movement, and the otherpole of the battery being arranged centrally, and a lamp secured to saidcarrier and having one of its terminals connected with said carrier,While. the other lamp terminal is arranged centrally and adapted to bemoved into and out of contact With the central pole of the battery bythe said relative movement of battery and carrier. A

3.v The combination of thev battery and the lamp carrier having a screwconnection so I- that rotation of the one relatively to the otherwillmove them toward or from each other, said carrier remaining inconductive relation to one of the battery poles during such movement,and the other olev of the battery being arranged centra ly, and a lampsecured to said carrier and having one of its terminals connected withsaid carrier while the other lamp terminal 1s arranged centrally andadapted tobe moved into and out of contact with the central pole of thebattery by the said relative movement. of battery and carrier. a

4. A flashf-light comprising a casing open at -one end and carrying atits other end an incandescent bulb having a central terminal ing, andthe other battery pole being located centrally so as to come into and.out of contact with the central terminal of the bulb, whereby tle saidterminal and pole form a switch located Within said casing and protectedthereby.

5. A flash-light comprisingv a casing, an incandescent bulb carried bysaid casing and having a i central terminal, and a battery movable insaid casing toward and from the bulb and provided with a Acentral polecon-'- cealedv and protected .by the casing and adapted -for en agementwith the lcentral termina-l of the ulb, the other terminal of the bulbbeing in permanent electrical con-v nection lwith the other pole of thebattery, whereby the lightin and extinguishing of the bulb iscontroller? of the battery actuating a protected internal switch formedby said centralpole and4 terminal. v

In testimony, that I claim the foregoing by the mere movement as myinvention, I have signed my namel in presence of two Subscribingwitnesses.

FRITZ BLAU.

Witnesses: 9 A

WOLDEMAR HAUPT, HENRY HASPER.

